package com.netty.test.server;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
/**
 * Sharable表示此对象在channel间共享
 * handler类是我们的具体业务类
 * */
@Sharable//注解@Sharable可以让它在channels间共享
public class EchoServerHandler extends ChannelInboundHandlerAdapter {
	public void channelRead(ChannelHandlerContext ctx, Object msg) {
		System.out.println("server received data :" + msg);
		ctx.write(msg);// 写回数据，
	}

	public void channelReadComplete(ChannelHandlerContext ctx) {
		ctx.writeAndFlush(Unpooled.EMPTY_BUFFER) // flush掉所有写回的数据
				.addListener(ChannelFutureListener.CLOSE); // 当flush完成后关闭channel
	}

	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		cause.printStackTrace();// 捕捉异常信息
		ctx.close();// 出现异常时关闭channel
	}
}
